Alerting device and system for abnormal situations
Patent 5572201 Issued on November 5, 1996. Estimated Expiration Date: August 5, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
A warning system for alerting a person to an emergency situation which includes a transmitter responsive to a visual or acoustic alerting system for transmitting an alarm signal on an RF carrier and a control signal on a sideband of the carrier. A tuneable receiver for receiving commercial broadcasts in a normal operating mode transfers to an emergency mode upon detection of the control signal and converts the alarm signal to an acoustic signal. In one embodiment, the visual or acoustic alerting system is a siren and light system of an emergency vehicle. In this embodiment, a transceiver is preferably included for dedicated communications among emergency vehicles. The range of both the transmitter and transceiver complement and are substantially the same as the effective range of the visual or acoustic alerting system.
Brochure entitled "Feasibility Study of In-Vehicle Warning Systems", prepared by U.S. Department of Transportation, National Highway Traffic Safety Administration, Washington, D.C. 20590, May 1975
Product brochure for The Lookout.RTM. National Emergency Vehicle Warning System receiver units by the South Carolina Sheriffs' Association, three pages (undated)
1993 NERAC Inc. report entitled "Problem Solving Report RDS," identifying 73 citations from a database search and providing abstracts for each of them